Think about it, man: you're not gonna be satisfied with a stock small block. You're going to wanna make that faster, too. When you get finished spending all that coin and dust some clown in a Rustclang at the strip, you'll have done it with a V8, and that's cool, but imagine building a 225, saving a whole $h!+-ton of jack and seeing the look on the other guy's face when, after you blow his doors off, you pop the hood to reveal a slant 6.
besides, V8 swaps can be prohibitively expensive if you're on a tight budget.